1 files changed, 2 insertions, 2 deletions
diff --git a/include/odhtdb/Signature.hpp b/include/odhtdb/Signature.hpp
index 270b099..dac856b 100644
--- a/include/odhtdb/Signature.hpp
+++ b/include/odhtdb/Signature.hpp
@@ -53,7 +53,7 @@ namespace odhtdb
         {
             friend class KeyPair;
         public:
-            static PublicKey ZERO;
+            const static PublicKey ZERO;
             
             // Throws InvalidSignatureKeySize if size is not PUBLIC_KEY_NUM_BYTES
             PublicKey(const char *data, size_t size);
@@ -93,7 +93,7 @@ namespace odhtdb
         {
             friend class KeyPair;
         public:
-            static PrivateKey ZERO;
+            const static PrivateKey ZERO;
             
             // Throws InvalidSignatureKeySize if size is not PRIVATE_KEY_NUM_BYTES
             PrivateKey(const char *data, size_t size);